Apparatus for burning portland cement.



T. A. EDISON. APPARATUS FOR BURNING POBTLANDOEMBNT.

' APPLICATION FILED NOV.26, 1906. 936,49. Patented Aug. 10, 1909;

2 SHEETS-SHEET l.

Jazz

APPLICATION TILED NOV. 26, 1906.

Patefited Aug. 10,1909.

jzwafie Zar:

- Jazz THOMAS A..;. enrsoN, OELLEWELLYN PARK, onanenjnnw JERSEY.

Specification of Letters Fetent.

Patented Aug. 10, was.

Application filed. November as, i996. s t-in No. name.

Toell whom it may concern:

Be it known that'l, THOMAS A. Enrson, {L

vn Park, Orange, county o1 Essex,

new and useful Improvements in Apparatus for Burning Portland Cement, of whicl the following is a description.

z invention relates to an improved appaitltlls for burning Portland cement and my object is to provide anapparatus of the retary type, in which the products of combustion may be utilized effectively to heat. an economizer or other industrial apparatus, so as to obtain increased economy.

it has been heretofore proposed to direct "the products of combustion from a rotary cement kiln into an economizer or hot stove, but such an expedient has been commercially-and practically unsuccessful, owing to' the fact that the products of combustion carry with them out of the kilnconsid'erable quantities or the line dust or chalk.

In an application for Letters Patent, filed October 24th, 1906, Serial No. 343,299, I describe an improved cement burning apparatus in which 1 utilize in tombination with a rotary kiln, a settling chamber and filter of constant porosity, whereby any line material carried out of the kiln with the draft will be. separated therefrom, and this separation takes place even when the proportion of line material carried with the draft is enormously increased by showering the material diametrically across the kiln, so as to sub stantially fill the bore thereof with a. mass or cloud oi the chalk. The rise of a filter of this character or of ancquivalent type, in

combination witha rotary cement kiln, makes iii-possible to ellectively obtain an additional economy by directing the filtered products of combustion through an economize hot stove, or other industrial device, in winch heat is utilized, since the products of combustion are perfectly clean and carry he: wl h is adapted to be heated by prodof no usllou from the :liltcr. Fig. 2,

an c la -u sectional showing the r or the United States, residing at ate or New Jersey, have invented cer-' upper end of the kiln and filter., and Big. 3, a cross sectional View throu the filter.

In all of the above view corresponding parts are'represented by the same numerals of reference.

The kiln 1, is made preferably of cast iron sections as heretofore, of any suitable length, preferably about 150 feet, and is maintained on rollers so as to be supported in an in clined position. Near its-upper end, the kiln is preferably formed with enlarged sections 2, .within which are located wings 3, for showering the material diametrically across the kiln, as I describe in said application. The pulverized material is fed into the kiln from a. hopper 4:, by means of a screw conveyer'5. Material in transit through the kiln is bi' rned by finely pulverized coal or 'gas, supplied through one or more burners 6. The upper end of the kiln opens into a chamber 7, from which leads a pipe 8, into the central portion 9, of the filter, constituting a settling chamber.. This pipe is preferably extended obliquely upward from its base, as shown, so as to permit a settling operation to take lace therein, and efiect a return of a portion of the solid, material to the chamber 7. The sidewalls of the settling chamber are formed of partitions l0, supplied with coarse granular material, presenting innumerable minute pores, and tortuous channels, andconstituting the filtering walls. .Suitablc mechanism is employed for replenishing the coarse material and for screening the fine chalk collected therein, as I describe in said application. The products of combustion, after passing through the two filter walls, enter pipes 11, leading to a fan 12, the discharge from which connects with an economize! 13, or other industrial device, in which heat may be absorbed. As a convenient illustration. I show a well known term of feed water heater for abstracting: heat from the products of combustion. From the economizer or other device, leads a stack 14-. The fan 12 is preferably operated by an electric motor controlled by the kiln man at the front. of'ihe kiln, whereby the draft will be always under perfect regulation. Extendinnaround the economizer 13 is a by-pass 15, whereby the products of combustion may be forced directly into the stack 14 when desired. suitable dampers it being provided to control the pathol' the products of combustion, as will be understood. in operalie tion, itjwill be understood that as the fine material progresses througl'i the kiln, it Will heated very perfectly and much of the heat from the produclsof now lost- Will be'absorbed by the material. From the kiln the products of combustion, carrying with them a necessarily large pro portion of the line cl'lalli, pass into the settling chamber 7, in which their velocity Will be greatly reduced, so that much of, the chalk or line oust will be settled by ,gravity: FIOJH the settling chamber, the gaseous currents seep slowly througlrthetwo filter walls, in which any reinainingfine material will be separated. After leaving the filter, the products of combustion which are now free from any solid matter, error the economizer, or other ii'idustrial down and give up an additional. increment of heat, so that when they pass out oi the stack 14', their temperature will be very low. Obviously, the heat thus imparted to the economize]? may be used industrially in the plant.

Having now described my ii'ivention, What I claim as new and desire to secure by Let'- ters Patent is as follows:

i. In cement burning apparatus, the combinalion with a rotary kiln, means for burning material in transit through the same, and a settling chamber and a filter connected with the discharge from the kiln and by which any solid material will be separated from the products of combustion therefrom, ol :1 heat, absorbing industrial device con-' i'iccted with the filter and to "which the producls oi combustion are finally directed, as and for the purposes set ."l'orth.

In cement burning apparatus, the coinbination with a rotary kiln, means for burning material in transit through the same, and a settling chamber and a filter coi'inected with the discharge from the kiln and by which any solid n'ialerial wil be separated combustion therefrom, oi? a feed water heater connected with the filter and to which the products of combustion are finally directed, substantially as and for the purposes set forth.

3 In cement burning apparatus, the cone bination with a rotary kiln, means for burn ing material in transit through thesame, and a settling llllllllJQl' and lillier connect ed. with the discharge from the kiln and by which any solid material will be separated from the products of combustion viherelrom, of about: absorbing industrial device counc ctedvwiththo lilte 'aiid l'o'which the products of combustion are linullydirected, and a controllable exhaust vtan :l'or niaiinujning the products ofcoinbusiion in circulation, as and for the purposes set torl'h.

l. in cenient lnn'ninp; apparatus, the combination with a rotary kiln, means for burn ing n'iuterial in transit through the some, and a filter connected \yilhllie dischargifrom he kiln l'or scparnting .l ioin the products o1" coiuluistiun the olid mutter carried out ol the kiln lilicrcn'ith, of :i hear absorbig indu. in} device to which the producls of COJUlJUSIIUll are directed alter leaving the filter a liy-1- ss shunting" the heat absorbing device, a .ick to which both the device and the lily-P1185 are connected, and, a controllablc fan for nminluiniing' and regulating the draft through either the said device or (he said bypass, snbsuunially as and for the. purposes set forth.

In coinenl burning appurnlus, the combinalion with a rotary kiln, means for burn ing material in transit, ll'li't'illgll the same, and a filter adjacent to the kiln, and a line connecting the discharge from the kiln with said filter and presenting an inwardly and dou'nuuirdly obliquely arrungwl section for permitting a settling operation to lake place, substantially as and for the pnrlioscs set forth.

6. .ln ceinem lun'nin g apparatus, the combinnlion with a rotary kiln means for burnin-g n'mleriul in transit through tin same, a filler :Hljumnl ll) the kiln, :1 llnc connecting the discharge from the kiln with the said filter and presenting an obliquely arranged swrlion loiywrmitting u settling operation 1o lake place, a li uiabsorbing in sluslrinl device (,Hlli! 5cl=\ l with the filler und in which the products oi conduisiion are iinally directed, and a b ui-- sluinting the heal absorbing deviwa, substantially us set: forth.

'lhis. spwilh-ulion signed uni. this llilh day o f Formula-r 15106.

\\ it nesscd Wii nosses:

FRANK l4. Uri-1n, JlIYNA ll. lime-mi. 

